LocalReport.SetParameters 异常 尝试设置报表参数“ParameterName”；本报告中未定义的

Question

我有两个按钮（按钮1，按钮2） 这两个按钮打开两个相同的报告，只是如果我先按下按钮1，则report2.rdlc有一个字符串参数

消息框显示参数计数= 0（如预期）并且我会在reportviewer1中显示report1.rdlc 如果然后我按下按钮2消息框再次显示参数计数= 0（我希望它显示1）并且我得到LocalProcessingException {“尝试设置一个不是报告参数'Report2ParameterString'在此报告中定义。"}

如果我先按下按钮2消息框显示参数计数= 1（如预期）并且我会在reportviewer1中显示report2 如果然后我按下按钮1消息框再次显示参数计数= 1（我希望它显示0）我会在reportviewer1中显示report1.rdlc，无一例外

我的代码是

private void report1Button_Click(object sender, EventArgs e)
    {
        reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\report1.rdlc";
        MessageBox.Show("parameters count =" + reportViewer1.LocalReport.GetParameters().Count.ToString());
        reportViewer1.LocalReport.DataSources.Clear();
        reportViewer1.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", reportDataTable));
        reportViewer1.RefreshReport();
    }
    private void report2Button_Click(object sender, EventArgs e)
    {
        reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\report2.rdlc";
        MessageBox.Show("parameters count =" +reportViewer1.LocalReport.GetParameters().Count.ToString());
        reportViewer1.LocalReport.SetParameters(new ReportParameter("Report2ParameterString", " testing Report2ParameterString"));
        reportViewer1.LocalReport.DataSources.Clear();
        reportViewer1.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", reportDataTable));
        reportViewer1.RefreshReport();
    }

Answer 1

在加载新报表之前调用 ReportViewer.Reset()。

例如：

reportViewer1.Reset();
reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\report2.rdlc";
...